Publication date: 08/13/2020

You can specify two Y columns when some of the degradation measurements are interval censored or left censored. For a given row, values in the two Y columns are handled as follows:

• If the two Y values are equal and neither is missing, then the common measurement is treated as exact.

• If the two Y values are not equal and neither is missing, then the measurement is interval censored and assumed to be between the two values.

• If only the first value is missing, then the measurement is left censored and assumed to be smaller than the second value.

• If only the second value is missing, then the measurement is right censored and assumed to be larger than the first value.

Note: The only way to fit left-censored measurements in the Destructive Degradation platform is through the use of two Y columns.

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